Sniper lvling Specc and pvp

Hi, first I would like to say that iam So damn impressed with Swtor. Secound of all I write here because I want a good pvp specc for my sniper class. I heard leath is the best but is it shit to quest with?

im using Engineering while i level my Sniper for both pvp and questing mainly because its burst is crazy i can usually 2-4 shot everyone with a ambush/explosive probe to snipe or takedown imo leath isnt worth it till 30 when you get cull but thats just me i think